Question

One of your lightbulbs has burned out and you are deciding whether you should replaced it with incandescent lightbulb or LED one. A (7 watt) LED lightbulb cost $15 more to purchase than a (75 watt) incandescent light bulb, but the LED light bulb cost $.08 per day less to operate.

How many days will take for the lower operating cost of the LED lightbulb to pay back on its initial purchase price?

A) A little more than half a year

B) Less than a half a year

C) More than a year

D) Unable to determine

Answer 1

Calculation of No. of days will take for the lower operating cost of the LED lightbulb to pay back on its initial purchase price
Purchase price of bulb	15
Saving per day	0.08
No. of days it will take to cover cost	187.5	(15/0.08)
Correct Option A i.e. A little more than half a year
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